An alloy of iron, neodymium and this element forms a tetrahedral structure in strongest permanent magnet known. A reagent containing this element has two atoms of it flanked by two cyclooctadine rings, and a class of reducing agents incorporating it have it bonded to 3 sec-butyl groups with a lithium counterion. Besides 9-BBN and the selectrides, this atom is also bonded to four hydride atoms with a sodium counterion in a gentler alternative to lithium aluminum hydride. One class of derivatives of this element are given prefixes like closo- and arachno-; many of those compounds dimerize via three-center two-electron bonds to satisfy the octet
An alloy of iron, neodymium and this element forms a tetrahedral structure in strongest permanent magnet known. A reagent containing this element has two atoms of it flanked by two cyclooctadine rings, and a class of reducing agents incorporating it have it bonded to 3 sec-butyl groups with a lithium counterion. Besides 9-BBN and the selectrides, this atom is also bonded to four hydride atoms with a sodium counterion in a gentler alternative to lithium aluminum hydride. One class of derivatives of this element are given prefixes like closo- and arachno-; many of those compounds dimerize via three-center two-electron bonds to satisfy the octet rule. A common anti-Markovnikov reaction uses this element, which has isotopes of atomic weight 10 and 11. For 10 points, name this element with atomic number five.
An alloy of iron, neodymium and this element forms a tetrahedral structure in strongest permanent magnet known.
{boron} [or {B}]